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RAND_pseudo_bytes(3) - RAND_bytes, RAND_pseudo_bytes - generate random data - man 3 RAND_pseudo_bytes

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RAND_bytes(3)                       OpenSSL                      RAND_bytes(3)



NAME
       RAND_bytes, RAND_pseudo_bytes - generate random(3,4,6) data

SYNOPSIS
        #include <openssl/rand.h>

        int RAND_bytes(unsigned char *buf, int num);

        int RAND_pseudo_bytes(unsigned char *buf, int num);

DESCRIPTION
       RAND_bytes() puts(3,n) num cryptographically strong pseudo-random bytes into
       buf. An error(8,n) occurs if(3,n) the PRNG has not been seeded with enough ran-
       domness to ensure an unpredictable byte sequence.

       RAND_pseudo_bytes() puts(3,n) num pseudo-random bytes into buf.  Pseudo-ran-
       dom byte sequences generated by RAND_pseudo_bytes() will be unique if(3,n)
       they are of sufficient length, but are not necessarily unpredictable.
       They can be used for non-cryptographic purposes and for certain pur-
       poses in(1,8) cryptographic protocols, but usually not for key generation
       etc.

RETURN VALUES
       RAND_bytes() returns 1 on success, 0 otherwise. The error(8,n) code can be
       obtained by ERR_get_error(3). RAND_pseudo_bytes() returns 1 if(3,n) the
       bytes generated are cryptographically strong, 0 otherwise. Both func-
       tions return -1 if(3,n) they are not supported by the current RAND method.

SEE ALSO
       rand(1,3)(3), ERR_get_error(3), RAND_add(3)

HISTORY
       RAND_bytes() is available in(1,8) all versions of SSLeay and OpenSSL.  It
       has a return value since OpenSSL 0.9.5. RAND_pseudo_bytes() was added
       in(1,8) OpenSSL 0.9.5.



0.9.7d                            2002-09-25                     RAND_bytes(3)

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